Home / 20,890.12-28,828.40-11,459.20

Finding the Fourth Proportional to 20,890.12, 28,828.40 and 11,459.20

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Solution

The fourth proportional to 20,890.12, 28,828.40 and 11,459.20 is: 15,813.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.12 : 28,828.40 = 11,459.20 : x
  2. Step 2: Convert to fraction form
    20,890.12/28,828.40 = 11,459.20/x
  3. Step 3: Cross multiply
    20,890.12x = 28,828.40 × 11,459.20
  4. Step 4: Simplify right side
    20,890.12x = 330,350,401.28
  5. Step 5: Solve for x
    x = 330,350,401.28/20,890.12
  6. Step 6: Final answer
    x = 15,813.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.